/**
 * Fetches the application runtime config from static files served next to the app.
 *
 * Looks up `config.{json,jsonc}` and an optional `config.local.{json,jsonc}` overlay,
 * with the local file taking priority. The shape of the returned object is
 * application-specific, so the concrete type is provided by the caller.
 */
export declare function fetchConfig<T>(): Promise<Partial<T>>;